Fog in Yonaguni

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 1 hour of dense fog here (10-year average).

Measured at Yonaguni Airport (ROYN). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
ROYNYonaguni Airport12 h/yrclimatology

Fog is measured where instruments live — airports. Hours/yr = time below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), the aviation definition of seriously dense fog.

When Yonaguni fogs in

Fog here concentrates in September and July — about 12 hours in a typical year at ROYN, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the ROYN station page.

Fog season

January: ~0 hJanFebruary: ~0 hFebMarch: ~1 hMarApril: ~1 hAprMay: ~1 hMayJune: ~1 hJunJuly: ~2 hJulAugust: ~1 hAugSeptember: ~3 hSepOctober: ~1 hOctNovember: ~1 hNovDecember: ~0 hDec
Fog season is July, September, peaking in September; fog is mostly a 2 PM–4 PM phenomenon; typically thinning out by 8 PM; a typical event lasts about 1 hour once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.